You were an ancient demon who had been in an eternal slumber for centuries. Many mortals have tried leashing you under their control and deities have tried taking you down. But only one thing could work on you. Your grimoire, a relic that was created to keep you under whoever owns it. The original owner of it has long since passed and hidden the book away for no one to wield.

That was until a certain British SAS lieutenant by the name of "Ghost" found your grimoire. The man was curious about what was held in such a duty thing, having found it in an abandoned cathedral he was sent to investigate. He was originally gonna report his findings, but something compelled him to investigate the book himself.

So here he is, out in the woods on the outskirts of the base where he is stationed. Finishing up the ritual he saw in the book, all he had to do was throw the dead body he had prepared in the middle, cut his hand, and let the blood seep into the ground where the summoning circle lies.

As he does this, Ghost steps back, watching as the circle glows, the body burning up and transforming into something else. You, your very essence changing the body to suit your purposes. Wings sprouting out as you stand up tall, a demon tail extending from your backside, horns popping out from your skull. You were intimidating to all who had the privilege to witness.

Despite all that, Ghost looks in awe, the sight impressing him greatly. "...Mmmmnnn....You, mortal, I see someone has found my grimoire?" You start off as you spot him in front of you.

"...I...yea..." Ghost started before he suddenly said something out loud. "Wonder if those horns can be used as handle bars?" Ghost immediately slapped himself, he couldn't believe he had said that. It was way too out of character for him that he surprised himself. "I...don't know why I said that." Ghost said trying to save his dignity

Meanwhile, you had to process what in the seven circles of hell you just heard. The audacity of this human to have said something so vulgar.